New CAX30, Xfinity Issues

I was using an older Netgear Modem and Netgear Router and Comcast told me it was no longer in their recommendations. For a couple of years they told me I was at the 800Mbps service tier (started off...

cax30s

FURRYe38

Guru - Experienced User

May 16, 2025

What Firmware version is currently loaded?

Please post a copy and paste of the modems connection status and event log page.
https://kb.netgear.com/30007/How-do-I-obtain-the-cable-connection-information-from-a-NETGEAR-cable-modem-modem-router
https://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-modem-router

Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem.

gkski

Aspirant

May 17, 2025

Hardware Version

V1.01

Firmware Version

V2.2.4.2

Cable Firmware Version

V1.04.10

Connection Status

IP Address	xx.xx.xx.xx 2001:558:6017:43:d5fe:6c61:5418:349c
Subnet Mask	xx.xx.xx.xx 128
Default Gateway	xx.xx.xx.xx fe80::21c:73ff:fe00:99
DHCP Server	0.0.0.0
DNS Server	75.75.75.75, 75.75.76.76 2001:558:feed::1 2001:558:feed::2
Lease Obtained	0 days, 2 hours, 0 minutes, 0 seconds
Lease Expires	0 days, 1 hours, 42 minutes, 19 seconds

Event Log

Time	Priority	Description
2025-05-16 08:14:01	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 194; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;CM-MAC=2xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
2025-05-16 08:12:25	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 194; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
2025-05-15 14:51:28	Critical (3)	UCD invalid or channel unusable;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
2025-05-15 14:51:28	Notice (6)	DS profile assignment change. DS Chan ID: 33; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
2025-05-15 14:51:27	Notice (6)	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
1970-01-01 00:00:31	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
1970-01-01 00:00:25	Critical (3)	UCD invalid or channel unusable;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
1970-01-01 00:00:24	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
2025-05-14 12:57:11	Critical (3)	UCD invalid or channel unusable;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
1970-01-01 00:00:26	Critical (3)	UCD invalid or channel unusable;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
1970-01-01 00:00:24	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
2025-05-14 10:19:21	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;

FURRYe38
Guru - Experienced User
May 19, 2025
There is more down the page for the connection status if you can post that as well.

For the event log, Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem.
- gkski
  Aspirant
  May 20, 2025
  No. That was the complete Connection Status from the advanced page. I will have to get Comcast involved but not hopeful.
  - FURRYe38
    Guru - Experienced User
    May 20, 2025
    There will be more to that page, be sure you SCROLL Down the page. It will look similar to that is posted here in this thread: https://community.netgear.com/discussions/home-cable-modems-routers/re-switched-from-cm3000-to-cax80-and-it-destroyed-uploaddownload-speeds/2455450

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New CAX30, Xfinity Issues